Line data    Source code

       1              : /*
       2              :    This file is part of TALER
       3              :    Copyright (C) 2022 Taler Systems SA
       4              : 
       5              :    TALER is free software; you can redistribute it and/or modify it under the
       6              :    terms of the GNU General Public License as published by the Free Software
       7              :    Foundation; either version 3, or (at your option) any later version.
       8              : 
       9              :    TALER is distributed in the hope that it will be useful, but WITHOUT ANY
      10              :    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
      11              :    A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
      12              : 
      13              :    You should have received a copy of the GNU General Public License along with
      14              :    TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
      15              :  */
      16              : /**
      17              :  * @file exchangedb/compute_shard.c
      18              :  * @brief Implementation of the compute_shard function for Postgres
      19              :  * @author Christian Grothoff
      20              :  */
      21              : #include "exchange-database/compute_shard.h"
      22              : #include "helper.h"
      23              : 
      24              : 
      25              : uint64_t
      26          191 : TALER_EXCHANGEDB_compute_shard (const struct TALER_MerchantPublicKeyP *
      27              :                                 merchant_pub)
      28              : {
      29              :   uint32_t res;
      30              : 
      31          191 :   GNUNET_assert (GNUNET_YES ==
      32              :                  GNUNET_CRYPTO_hkdf_gnunet (
      33              :                    &res,
      34              :                    sizeof (res),
      35              :                    merchant_pub,
      36              :                    sizeof (*merchant_pub),
      37              :                    "VOID",
      38              :                    4));
      39              :   /* interpret hash result as NBO for platform independence,
      40              :      convert to HBO and map to [0..2^31-1] range */
      41          191 :   res = ntohl (res);
      42          191 :   if (res > INT32_MAX)
      43           69 :     res += INT32_MIN;
      44          191 :   GNUNET_assert (res <= INT32_MAX);
      45          191 :   return (uint64_t) res;
      46              : }